Patzer

(at around 6 mins) As with many dinosaur movies, they refer to the flying dinosaur as a pterodactyl, which had a head resembling a modern bird-without a crest. The crest behind its beak is as large as the beak. That indicates a Pteranodon, a different species.

Though it's played for comedic purposes, a severed arm in a shark's mouth would never be able to 'pull' the muscles to squeeze the trigger of a gun over and over again.

A few times in the film, it's clear that the actors are 'inserted' onto a background screen.

(at around 1h 15 mins) During the close-up of Fin shooting the M-60, not once did the ammunition belt move.

The steam locomotive switches from American, to European, and Japanese various times during the escape from the "Wild West" sequence. The footage of the European and Japanese locomotives were stock footage compiled from various websites, while the American locomotive was filmed on site.

(at around 1h 25 mins) Raymond Liu is listed twice for the same role (Still Photographer of Los Angeles unit) in the on-screen credits.

A historic medieval era with magic was never proven to actually exist.

The CGI of the sharks, dinosaurs and effects is poor. [It has been explained by the filmmakers that viewing it requires a strong 'suspension of disbelief'].

(at around 26 mins) When visiting Revolutionary America, the flag show outside of Washington's encampment is the Stars and Bars, the first national flag of the Confederacy. Keep in mind the production company is Canadian.

At around 27 minutes the (newer) Union Jack adopted in 1801 can be seen flying on a British ship. The American Revolutionary War lasted from 1775 to 1783.

The film has numerous 'plot holes' with time-travel alteration. One example is: 'Bionic' April was built due to her death. If she got saved by Gill using time travel, then 'Bionic' April (albeit only her head is shown in the film) would have ceased from existence.

At 15:26, the character Winter uses the term prophesized, instead of prophesied.